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On Jan 26, 2021, at 9:15 PM, Henry Spencer <hspencer@xxxxxxxxxxxxx> wrote:
(My take? I'd say that in recent decades there has been too much obsession
with high Isp, and not enough attention to high mass ratio in general and
high engine T/W in particular, and I think the latter need to come back into
style. It's gotten bad enough that True Believers in parametric models have
been heard to claim that mass numbers for real flown stages must be wrong
because their mass ratios couldn't possibly be that high.)
Henry